linux-kernel - Re: [PATCH] arc:kernel:perf_event.c : replaced sprintf with sysfs

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Message-ID: <CAG+54DZS36Lp3Wc2nh+uSR14GPOWK+LJePp-jW1oB13uGtiSHw@mail.gmail.com>
Date: Tue, 22 Jul 2025 09:22:57 +0530
From: Rujra Bhatt <braker.noob.kernel@...il.com>
To: Greg KH <greg@...ah.com>
Cc: peterz@...radead.org, mingo@...hat.com, acme@...nel.org, 
	namhyung@...nel.org, mark.rutland@....com, alexander.shishkin@...ux.intel.com, 
	jolsa@...nel.org, irogers@...gle.com, adrian.hunter@...el.com, 
	kan.liang@...ux.intel.com, vgupta@...nel.org, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-snps-arc@...ts.infradead.org, skhan@...uxfoundation.org, 
	linux-kernel-mentees@...ts.linux.dev
Subject: Re: [PATCH] arc:kernel:perf_event.c : replaced sprintf with sysfs_emit()

On Fri, Jul 18, 2025 at 5:18 PM Greg KH <greg@...ah.com> wrote:
>
> On Fri, Jul 18, 2025 at 03:57:20PM +0530, Rujra Bhatt wrote:
> > Hi,
> >
> > On Sat, Jul 5, 2025 at 1:00 PM Rujra Bhatt <braker.noob.kernel@...il.com> wrote:
> > >
> > > Replaced sprintf() with sysfs_emit() in sysfs*_show() function in
> > > perf_event.c file to follow the kernel's guidelines from
> > > documentation/filesystems/sysfs.rst
> > > This will improve consistency, safety, and makes it easier to maintain
> > > and update in future.
> > >
> > > Signed-off-by: Rujra Bhatt <braker.noob.kernel@...il.com>
> > > ---
> > >  arch/arc/kernel/perf_event.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/arch/arc/kernel/perf_event.c b/arch/arc/kernel/perf_event.c
> > > index ed6d4f0cd621..424ec072c441 100644
> > > --- a/arch/arc/kernel/perf_event.c
> > > +++ b/arch/arc/kernel/perf_event.c
> > > @@ -648,7 +648,7 @@ static ssize_t arc_pmu_events_sysfs_show(struct device *dev,
> > >         struct perf_pmu_events_attr *pmu_attr;
> > >
> > >         pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
> > > -       return sprintf(page, "event=0x%04llx\n", pmu_attr->id);
> > > +       return sysfs_emit(page, "event=0x%04llx\n", pmu_attr->id);
> > >  }
> > >
> > >  /*
> > > --
> > > 2.43.0
> > >
> >
> > Gentle reminder for the replacement of sprintf() with the sysfs_emit(), kindly
> > review it.
>
> Why is this required?  There is no bug in the current code, so no need
> to change it at all.  Please just use sysfs_emit() for new sysfs files,
> no need to churn the tree and change all existing entries, otherwise we
> would have done this a long time ago when we introduced these functions.
>

Hi Greg,
I appreciate your feedback.

I wanted to bring the formatting in line with the
latest guidance, especially since sysfs_emit() has become the recommended
method for sysfs output. I see now, though, that I should restrict myself to
using that helper only in the context of genuine bug fixes or in the course
of adding features.
I'll make sure to only use sysfs_emit() for new sysfs entries or when
modifying existing files for actual bugs or feature changes,
as per your guidance.

Thank you so much for pointing this out.

regards,
Rujra Bhatt